Pneumatic tool



Feb. 5, 1924.- R. B. BUTTERBAUGH PNEUMATIC TOOL Filed Anm 25', 1921 Patented Feb. 5, 1924. L494 UNITED STATES PATEN ser EL'.

Entra B. BUTTEEBAUGH, orivrINNEAroLIs, MINNESOTA, AssIeNon 'ro EEUBEN E. HAUSER, or MrNNEAroLIs, MINNESOTA.

PNEUMATIC TOOL.v

Appliation mea Aprn 25, 1921. semi No. 464,481.

Twill-'whom t may concern-: Y i" j of the running or motion-transmitting ele- -Bl 'it-.knownthat T,-RALPH- BL BUTTER- ments of the device. j Y

BAUGH, a'citizen of the United States, resid- Preferably, the casing has two'hand pieces. ingiat Minneapolis, in" the Ycounty of Henneone in line with the axis of the motor shaft 6 pinv and Statev ofl Minnesota, have linvented and the otherl radiating therefrom, and the 60 certain new and useful' Improvements in latter is made hollow with the introduction Pneumatic Tools; and I do hereby dec-lare ofair to the motor and vis equipped with a the following to be a full, clear, and exact thumb-actuating controlling valve This ardescription vof the inventionsuch as will rangement permits the tool to be held prop- 'U enable others skilled in the Vart towhich it erly to its work and guided by' the hands o5 appertais t make and use theisame, 0f the OperatOl and the Speed Of the IIlOtOl' Mylinvention provides what is herein "desalso to be readily controlled ignated as a pneumatic tool but which, in a In the accompanying drawings, which ilbroader sense,'f`1s a portable power deviceinlustrate the invention,like characters indicluding a motor and means for operating, cate like parts throughout the several views. 70

at will, various different kinds of tools with Referring to the drawings: either continuous rotary or oscillatory movc- Fig. l is a side elevation with some parts ments.l Generally stated, the invention conbroken away and some parts sectioned, showsists of the novel devices and combinations ing the improved tool or power device and of'devices hereinafter described and defined showing a grinding wheel applied to the 75 in the claims. i y j motor shaft;

The motor "is preferably a rotary pneu- Fig. 2 is a transverse section taken on thel matie motor mounted on a casing 'having line 2-2 of Fig. l, but showing a screw suitable handles orhandV pieces and connectdriver applied to the oscillatory sleeve of the edtofa sourcev of compressed air supply device; no through a flexible tube. The rotor of the Fig. 3 is a horizontal section on the line motor has a projecting driving `shaft to 3-3 of Fig. l; and which ia driving wheel, drill, buing wheel Fig. 4 is a horizontal section on the line Orother tool, that should be driven with a 4L of Fig. 2.

rotary motion, is adapted to `be applied, The casing, as shown, is made up of two ma preferably by screw-threaded engagement. shell sections 5 and 6, separated by a parti- Mounted in the cas-ing and surrounding the tion plate 7 ,said three elements, at their driving shaft of the motor isan oscillatory margins, being connected by machine screws drivingysleeve that receives vits oscillatory 8 or the like. The partition 7 divides the motion yfrom the motor' preferably through casing into two chambers 9 and 10, the former 9o a cam and a co-operating lever of novel oonof which affords a cylindrical chamber for struction and arrangement, and which cam the rotary head 1l of the pneumatic motor. and lever are located within the casing. The This head or rotor 11 of the motor is of oscillatory driving sleeve projects from the clylindrical form, is of less diameter than casing and a screw driver or other tool, that tie interior of the chamber 9 and runs in Q5 requires oscillatory motion, is adapted to be Contact therewith at one point marked 'i/ on secured thereto at will. Fig. 3; and here it may be noted that the In the abovearrangement, when the v'motor cylindrical wall of the shell 5, in the vicinity is in action the driving shaftof the motor of said point of contact y, has a slightly will'I be driven in a continuousdirection while. yielding segmental portion 12 that is adapt- 10o the sleeve will be continuously oscillated ed to be adjusted by a screw 13 so as to comaround the running shaft. Hence, the propensate forlwear and always prevent leali'- jeotingfends of the shaft and sleeve afford age of air past the contact point y.

means to which, in the first instance, tools The rotor ll has radially movable springrequiring rotary motionl may be applied, pressed propelling blades 14, and itis pro- 105 and, in the second instance, to which tools-revided with a driving shaft 16 that projects quiring oscillatory motion may -be applied, down through the. bottom of the shell 6 and,

anchas is evident, the Substitution of rotary as shown, is terminated in a threaded end 17 for oscillatory tools may `be made without onto which the internally threaded sleeve 18 requiring disconnection or adjustment of any of a rotary tool, such as a grinding wheel 19, is adapted to be screwed, as shown Vin Fig. 1.

djacent to the rotor 11, the motor shaft 16 is journaled in the partition 7, preferably by a ballbearing 20. The numeral 21 indicates a thrust-acting ballbearing interposed between the upper face of the rotor 11 and the top of the case shell 5. Said shell 5, above the bearing 21and in approximate alignment with the driving shaft 16, has a hand piece 22 in the. form of a knob.

At one side, the shell 5 is provided with a radially projecting hollow handle 23, to the outer end of which a flexible compressed air supply tube 24is attached. The inner end ofthe hollow hand piece 23 opens into the interior of the chamber 9 through an admission port 25, see Figs. 1 and 3, and, at approximately a diametrically opposite point, said chamber 9 is provided with discharge ports 26.

The admission port25 is normally' closed by an axially movable pressure-seated valve 27 mounted in the' hand piece 23 and arranged to be opened more or less, at will, by the beveled inner end of a thumb-actuated cam plunger 28 mounted in the hand piece 23, as shown in Fig. 1. The valve 27 is of the well known type which has a stem loosely fitting the port 25 so that there will be a passage of compressed air when said valve 27 is contracted.

The oscillatory driving sleeve 29 is journaled on the motor shaft 16 and in the lower wall of the shell 6. At its upper or inner end, the oscillatory sleeve 29 has a. projecting crank arm 30 provided at its free end with a crank pin 31. The numeral 32 indicates a lever pivoted at 33 to a' lug 34 depending from the partition 7. This lever 32 is preferably in the form of a yoke that'has an elongated interior` or slot with which it engages an operating cam in the form of an eccentric 35 carried by the motor shaft 16. .it its free extremity, this yoke-like lever 32 has a notch 36 in which works the crank pin 31 of the lever 32.

As is evident, when air is admitted to the (hamber 9, the rotor or head 11 of the motor, and the motor shaft 16, will be rotated in the direction of arrows marked on Fig. 3, so that any tool or device attached to the threaded or outer end of the motor shaft 16 will be rotated in a constant direction. However, the driving sleeve 29 will be continuously oscillated on the shaft 16 so that a screw driver or any other tool, attached to the lower or outer end thereof, will be continuously oscillated.

In Fig. 2, the numeral 37 indicates a screw driver which has a tubular stem 38, the upper end of which is adapted to be telescoped onto the end of said sleeve 29 and is split and providedwith llugs 39, which,

by4 a co-operating screw 40, adapt the split end rof said sleeve to be .securelyi clamped to said driving sleeve 29.

The screw driver attachment is especially adapted for use in grinding engine valves to their seats and, in this use, the device affords an extremely efficient valve grinder.

When a drill chuck or the like is applied to the rotary shaft 1,6, a drill is adapted to be held thereby and the device then affords a highly efcient portable power-driven drill. Of course, the device is capable of a very large range of use, by the substitution of various different kinds of tools, either rotary or oscillatory, in the manner described. Moreover, the device is simple and of comparatively small cost.

l/Vhat I claim is:

1. A portable power'device comprising a casing, an oscillatory sleeve projecting from said casing, aA rotary motor-driven shaft mounted in said casing and projecting through said sleeve, said sleeve and shaft being arranged to operate different tools, a lever pivoted within said casing and connected to said sleeve for oscillating the same, and an eccentric element carried by said shaft and directly operative `on said lever Vto oscillate the latter. j

2. A portable power-driven device of the kind described comprising a casing, an oscillatory sleeve projecting from said casing, a rotary motor-driven shaft mounted in said casing and projecting through said sleeve, said sleeve and shaft being adapted to operate different tools, an eccentric cam directly carried by said shaft within said casing, a yoke-like lever embracing and directly engaged by said cam` and pivoted within said casing at one end, said sleeve having an arm to which the other end of said lever is directly pivoted.

3. A portable power device of the kind de-` scribed comprismg a casing formed with two chambers, a pneumatic motor, the rotor of which works within one of the compartments of said casing and is provided with a driving shaft projected from said casing and adapted to carry a rotary tool, a sleeve surrounding said shaft Vand projecting from said casing and adapted to carry an Voscillatory tool, a crank arm on the inner end of said sleeve, a lever pivotedwithin said casing and connected to said crank arm, and a cam on said driving shaft operative on said lever to oscillate the same, said lever being in the form of an endless yoke that embraces said cam and, at its free extremity, has a slot that engages a crank pin provided onthe end of the arm of said` oscillatory sleeve.

In testimonywhereof I affix my signature.

RALPH B. iaUTTERBAiic-ii.v

llO 

